Platinum Recovered from Automotive Heavy-Duty Diesel Engine Exhaust Systems in Hydrometallurgical Operation
MONOLITHOS Catalysts and Recycling Ltd., Vrilissou 83, 114 76 Athens, Greece
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Academic Editors: Alexander McLean and Claudio Pistidda
Metals 2022, 12(1), 31; https://doi.org/10.3390/met12010031
Received: 29 November 2021
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Revised: 17 December 2021
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Accepted: 22 December 2021
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Published: 24 December 2021
(This article belongs to the Special Issue Recycling of Metal-Based Compounds for Energy and Technology Applications)
The current study is focused on platinum recovery from the secondary sources of end-of-life heavy-duty diesel oxidation catalysts (DOCs) and heavy-duty catalyzed diesel particulate filters (c-DPFs) in order to reduce the supply–demand gap within the European Union. The extraction of platinum was based on a hydrometallurgical single-step low acidity leaching system (HCl-H2O2-NaCl) and a calcination step that takes place before the leaching process. The parameters of calcination and leaching process were thoroughly investigated in order to optimize recovery efficiency. The optimized results proved that a calcination step (at 800 °C for 2 h) improves the recovery efficiency by a factor of 40%. In addition, optimal Pt recovery yield was achieved after 3 h of leaching at 70 °C, with a solid-to-liquid (S/L) ratio of 70 g/100 mL (70%) and 3 M HCl-1% vol H2O2-4.5 M NaCl as leaching conditions. The optimum Pt recovery yield was 95% and 75% for DOC and c-DPF, respectively. Since the secondary feedstock investigated is highly concentrated in platinum, the pregnant solution can be used as a precursor for developing new Pt-based catalytic systems.
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Keywords:
platinum group metals; hydrometallurgy; c-DPF; DOC; leaching
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MDPI and ACS Style
Papagianni, S.; Moschovi, A.-M.; Polyzou, E.; Yakoumis, I. Platinum Recovered from Automotive Heavy-Duty Diesel Engine Exhaust Systems in Hydrometallurgical Operation. Metals 2022, 12, 31. https://doi.org/10.3390/met12010031
AMA Style
Papagianni S, Moschovi A-M, Polyzou E, Yakoumis I. Platinum Recovered from Automotive Heavy-Duty Diesel Engine Exhaust Systems in Hydrometallurgical Operation. Metals. 2022; 12(1):31. https://doi.org/10.3390/met12010031
Chicago/Turabian StylePapagianni, Sotiria, Anastasia-Maria Moschovi, Ekaterini Polyzou, and Iakovos Yakoumis. 2022. "Platinum Recovered from Automotive Heavy-Duty Diesel Engine Exhaust Systems in Hydrometallurgical Operation" Metals 12, no. 1: 31. https://doi.org/10.3390/met12010031
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